3. TROUBLE SHOOTING

3-1 Check of ROM & NMOS-RAM - No calls on the system.

1.Put the 4 "LINK SELECT" switches of the HCU upward (Link No. 15 SELECT) and switch on the AC power of the exchange.

2.If there is no error, no HCU indication lamps will light.

3.In the event of a memory error, the lamps may light as shown in the example of Fig. 1.

4.The error indications will remain on until you use Link No. 15 for communications.

Example

No.1 and No.2 out of 6 pcs

ROMs (2716) have a "read" error.

No.0 and No.1 out of 4 sets of N-MOS RAMs (2114) have a "read" error.

(One set of RAMs consist of 2 ICs)

Indicate memory error.

LINK SELECT Switches set to select No. 15

3-2 Check of CMOS-RAM (Programmed data memory)

At the time of

1.initial programming using station No. 200 and

2.registration of single digit dialing number or personal number made at each station

you hear calling tone instead of confirmation tone if there is CMOS memory error.

(When the system does not work properly and the CPU unit is

considered to be its cause, put the system in the same condition and again operate it using the same CPU to see if

the same problems occur again. In the event of error repetition, change the CPU unit for the new one.)

3-3Indication on front panel of the CPU.

Error ROM • RAM Chip No.

6 5 4 3 2 1 0

Fig. 1

HCU indications

"RUN" LED indicator

When the system is working normally, LED is "on".

Check its condition when the system fails to work normally.

"SELF RESTART" LED indicator

This does not light when the system is working normally. Even if high noise from outside of the exchange

causes the CPU to work abnormally, the CPU "self-restarts" and the system keeps on working normally. Once

the CPU "self-restarts", the LED indicator is on, but it does not affect the system. If you again cycle the AC power

source, the LED indicator is turned off.

– 16 –

Page 17
Image 17
Vizio CPU-56 manual Check of ROM & NMOS-RAM No calls on the system, Check of CMOS-RAM Programmed data memory

CPU-56 specifications

Vizio has made significant strides in the television market, consistently delivering quality products at competitive prices. One of the standout models in their repertoire is the Vizio CPU-56, a smart television that boasts impressive features, technology, and characteristics designed to enhance the viewing experience.

The Vizio CPU-56 is equipped with a 56-inch display, delivering vibrant colors and stunning clarity thanks to its 4K Ultra HD resolution. The high pixel density ensures that images are sharp and lifelike, making it ideal for both movie nights and gaming sessions. The television supports HDR (High Dynamic Range) content, allowing for greater contrast and a wider color spectrum, which significantly enhances the visual appeal of movies and shows.

One notable feature of the Vizio CPU-56 is its Smart TV capabilities, powered by the Vizio Smartcast platform. This user-friendly interface provides access to a wide array of streaming services, including popular platforms like Netflix, Hulu, and Disney+. Integrated Wi-Fi connectivity allows users to connect to their home network seamlessly, making it easy to browse and enjoy content from various sources. The Smartcast platform also supports voice control through popular virtual assistants, simplifying navigation and enhancing user convenience.

For gaming enthusiasts, the Vizio CPU-56 includes features that cater specifically to that audience. The low input lag and quick response time ensure a smooth gaming experience, allowing players to react swiftly in fast-paced games. Moreover, the TV’s support for Variable Refresh Rate (VRR) helps to eliminate screen tearing and stuttering, providing an uninterrupted gaming experience.

The Vizio CPU-56 also excels in sound quality, featuring built-in DTS Studio Sound technology. This audio enhancement provides a rich and immersive sound experience that complements the stunning visuals. For those seeking even greater audio immersion, the TV is compatible with external sound systems and soundbars, allowing users to create a personalized home theater experience.

In terms of connectivity, the Vizio CPU-56 offers multiple HDMI ports, USB inputs, and Ethernet options, ensuring compatibility with various devices such as gaming consoles, Blu-ray players, and streaming devices.

Overall, the Vizio CPU-56 stands out as an impressive smart television that combines advanced technology, thoughtful features, and user-friendly functionality, making it an excellent choice for consumers seeking an enhanced viewing experience without breaking the bank.